<template>
  <form action="/">
    <van-search
        v-model="searchText"
        show-action
        placeholder="请输入搜索关键词"
        @search="onSearch"
        @cancel="onCancel"
    />
  </form>

  <van-divider content-position="left">已选标签</van-divider>

  <div v-if="activeIds.length === 0">请选择标签</div>

  <van-row gutter="16" style="padding: 0 16px">
    <van-col v-for="tag in activeIds">
      <van-tag  closeable size="small" type="primary" @close="doClose(tag)">
        {{tag}}
      </van-tag>
    </van-col>
  </van-row>

  <van-divider content-position="left"> 选择标签 </van-divider>
  <van-tree-select
      v-model:active-id="activeIds"
      v-model:main-active-index="activeIndex"
      :items="tagList"
  />
  <div style="padding: 12px">
    <van-button block type="primary" @click="doSearchResult()">搜索</van-button>
  </div>


</template>

<script setup>
import { ref } from 'vue';
import {useRouter} from "vue-router";


const router = useRouter();
// 标签列表
const originTagList = [
  {
    text: '性别',
    children: [
      { text: '男', id: '男' },
      { text: '女', id: '女' },
    ],
  },
  {
    text: '年级',
    children: [
      { text: '大一', id: '大一' },
      { text: '大二', id: '大二' },
      { text: '大三', id: '大三' },
      { text: '大四', id: '大四' },
      { text: '研究生', id: '研究生' },
      { text: '博士生', id: '博士生' },
    ],
  },
];

// 标签列表
let tagList = ref(originTagList);

// 搜索框组件
const searchText = ref('');
/**
 * 搜索过滤
 * @param val
 */
const onSearch = (val) => {
  tagList.value = originTagList.map(parentTag => {
    const tempChildren = [...parentTag.children];
    const tempParentTag = {...parentTag};
    tempParentTag.children = tempChildren.filter(item => item.text.includes(searchText.value));
    return tempParentTag;
  });
};
const onCancel = () => {
  searchText.value = '';
  tagList.value = originTagList;
};


// 选择标签组件
const activeIds = ref([]);
const activeIndex = ref(0);


const doClose = (tag) => {
  activeIds.value = activeIds.value.filter(item => item !== tag);
}

/**
 * 根据标签搜索用户（跳转到搜索结果界面，并将选择标签传过去）
 */
const doSearchResult = () => {
  router.push({
    path: '/user/list',
    query: {
      tags: activeIds.value
    }
  });
}

</script>

<style scoped>

</style>